There are more than 200 recognized types of headaches, but they all fall into two broad categories: primary headaches, where the headache itself is the condition, and secondary headaches, where the pain is a symptom of something else going on in your body. The three most common primary headaches are tension-type, migraine, and cluster headaches, and they each feel distinctly different. Understanding which type you’re dealing with can help you manage the pain more effectively and know when something more serious might be happening.
Tension-Type Headaches
Tension-type headaches are the most common headache in the world, affecting roughly 25% of the global population. The pain is mild to moderate and often described as a tight band wrapping around your head. You’ll typically feel dull pressure or tightness across your forehead, the sides of your head, or the back of your skull. Unlike migraines, tension-type headaches don’t usually come with nausea or vomiting, and they rarely stop you from going about your day.
These headaches can last anywhere from 30 minutes to several hours. Common triggers include stress, poor posture, eye strain, dehydration, and lack of sleep. Most people experience them occasionally, but some develop chronic tension-type headaches that occur 15 or more days per month. At that frequency, the constant low-grade pain can seriously affect quality of life even though each individual episode isn’t severe.
Migraines
Migraines affect about 14% of the global population, making them the second most common headache type. They’re far more than a bad headache. A migraine produces throbbing or pulsing pain, often on one side of the head (though both sides can be involved), along with sensitivity to light, sound, and sometimes smell and touch. Nausea and vomiting are common. An untreated attack lasts 4 to 72 hours.
What makes migraines unique is that they can unfold in up to four distinct phases. The first, called prodrome, can start one to two days before the pain hits. You might notice mood swings, food cravings, neck stiffness, increased thirst, or frequent yawning. About a quarter of people who get migraines also experience an aura phase, which typically builds over several minutes and lasts 20 minutes to an hour. Aura can include seeing flashing lights, bright spots, or zigzag shapes, along with tingling in a hand or arm, facial numbness, or difficulty speaking.
After the pain phase resolves, there’s often a postdrome that lasts up to a day. People describe feeling drained, foggy, and washed out, though some feel unexpectedly euphoric. Sudden head movements during this phase can briefly trigger pain again. Not everyone experiences every phase with every attack, and the pattern can vary over a lifetime.
Hormonal Migraines
Drops in estrogen are a well-known migraine trigger, which is why many women notice migraines tied to their menstrual cycle. The estrogen decline that happens just before a period can set off an attack. Conversely, the steady, high estrogen levels during pregnancy often improve or even eliminate migraines entirely, only for them to return after delivery when estrogen drops sharply. During perimenopause, the years leading up to a person’s last period, hormone levels fluctuate unpredictably and migraines often become more frequent and painful.
Cluster Headaches
Cluster headaches are rarer than tension-type headaches or migraines, but they’re among the most painful conditions a person can experience. The pain is severe to excruciating, centered around or behind one eye, and lasts between 15 minutes and 3 hours per attack. What sets cluster headaches apart is their pattern: attacks come in clusters, striking between once every other day and up to eight times a day during an active period that lasts weeks or months. These cluster periods are separated by remission phases that can last months or even years.
Cluster headaches also come with a set of distinctive physical symptoms on the same side as the pain. Your eye may water and become red. The eyelid can droop or swell. You might have a runny or congested nose on that side, along with facial sweating. Unlike migraines, where most people want to lie still in a dark room, cluster headaches produce intense restlessness and agitation. People often pace, rock, or feel unable to sit still during an attack.
Secondary Headaches
Secondary headaches aren’t a disorder on their own. They’re caused by another condition, substance, or change in your body. The list of possible causes is long: infections like meningitis or encephalitis, vascular problems like stroke or blood vessel tears, brain tumors, changes in brain pressure, carbon monoxide exposure, and medication side effects, among many others.
One of the most common secondary headaches is medication overuse headache, which affects about 2% of the population. It develops when someone with an existing headache disorder takes pain relievers too frequently, typically on 10 to 15 or more days per month (depending on the type of medication) for at least three months. The very medications meant to relieve headaches end up fueling a cycle of near-daily pain. Breaking the cycle requires reducing or stopping the overused medication, which often temporarily worsens headaches before they improve.
Caffeine withdrawal headaches are another common secondary type. Hormonal headaches triggered by estrogen changes (from birth control or hormone therapy, for example) also fall in this category. Even airplane travel has been recognized as a headache cause, producing a distinct severe pain during descent that disappears shortly after landing.
Episodic vs. Chronic Headaches
Any primary headache type can be classified as either episodic or chronic based on how often it occurs. The dividing line is 15 days per month. If you have headaches on fewer than 15 days per month, they’re considered episodic. Once they hit 15 or more days per month for more than three months, they’re classified as chronic. For chronic migraine specifically, at least 8 of those 15 monthly headache days must have migraine features.
This distinction matters because chronic headaches often require a different treatment approach than occasional ones. Over-the-counter pain relievers that work fine for episodic headaches can actually make things worse when used frequently enough to cross into medication overuse territory. If your headaches have gradually become more frequent over months, that escalation itself is an important signal worth paying attention to.
Headache Warning Signs
Most headaches, even painful ones, aren’t dangerous. But certain features suggest a secondary headache that needs urgent evaluation. The most concerning is a thunderclap headache: pain that reaches maximum intensity almost instantly, like a switch being flipped to 10 out of 10. This can point to a vascular emergency like a ruptured aneurysm.
Other red flags include a headache that feels fundamentally different from any you’ve had before, headaches that started after age 50 with no prior history, pain accompanied by fever and a stiff neck, headaches that progressively worsen over weeks, and neurological symptoms like weakness, confusion, vision changes, or difficulty speaking that don’t resolve. Headaches that worsen with coughing, straining, or changes in position can indicate pressure changes inside the skull. If a headache follows a head injury, even a seemingly minor one, that also warrants attention.
Imaging like an MRI is the most precise tool for identifying structural causes behind secondary headaches, including smaller tumors, infections, or pressure-related problems. A normal CT scan doesn’t always rule everything out, so additional testing is sometimes needed depending on the pattern and symptoms involved.